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Biogenic vs. abiogenic magnetite nanoparticles: A XMCD study

Abstract : X-ray magnetic circular dichroism (XMCD) experiments were carried out to compare the Fe2+/ Fe3+ ratio in nanomagnetite chemically produced from lepidocrocite and nanomagnetite biogenically produced by the Fe-reducing bacterium Shewanella putrefaciens. Together with TEM imaging, these measurements showed that the biotic magnetite nanoparticles were of excellent quality, with small size dispersion and high crystallinity. From the XMCD measurements, it could be shown that the biogenic nanomagnetite contained a higher amount of Fe2+ than the abiogenic nanomagnetite.
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Submitted on : Monday, September 29, 2008 - 2:55:22 PM
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Claire Carvallo, Philippe Sainctavit, Marie-Anne Arrio, N. Menguy, Yuheng Wang, et al.. Biogenic vs. abiogenic magnetite nanoparticles: A XMCD study. American Mineralogist, Mineralogical Society of America, 2008, 93, pp.880-885. ⟨10.2138/am.2008.2713⟩. ⟨hal-00325482⟩



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